Electrical therapeutic device



April 11, 1950 Filed March 12, 1948 ATTORNEY Patented Apr. 11, 1 950 i UNITED STATE STPATENT oFFicE ELECTRICAL THERAPEUTIC DE ICEv I h Fred J. Hart; Salinas, Calif. Application March 12, 1948, Serial No. 14,617

Another object is the provision of an electromagnetic oscillator having a low power output and associated with means for admitting a controlled electrical current of low amperage to the patient along with the high frequency output.

Other objects will be apparent from the following description and accompanying drawing, in which:

The figure is a diagrammatical view of the electrical circuits of my device.

Referring more particularly to the drawing, supply wires 2 and 3 are provided with an interference eliminator made up of the inductances 4 and 5 and the condenser 6 which operate in the conventional manner. An 01f and on switch I controls flow of current to the device in the usual manner. The supply wires 2 and 3 are connected to the ends of a primary coil 8 of the power transformer. This transformer is provided with a high voltage secondary coil 9 and a low voltage secondary coil ID. A wire I I joins one end of coil 8 with one end of coil 9. The other end of coil 9 is connected by a wire I 2 to one side of a tank circuit made up of a transformer secondary coil l3 and a condenser [4. The primary coil l5 of the latter transformer is connected to a condenser is forming a second tank circuit. One side of the tank circuit -45 is connected to the grid of a tube l1 and the other side is connected to the cathode of said tube [1.

A wire 18 connects one side of the tank circuit l3--|4 to one end of primary coil [9 of an audio transformer and the other end of coil I9 is connected to the plate of tube H. The cathode of tube I1 is connected to supply wire 2 by a wire 20.

The low voltage coil In of the power transformer is connected to wires 2| and 22 and the latter are connected to the filaments of both tubes l1 and 24.

One end of the secondary coil 25 is connected through a choke coil 23 and wire 26 to the plate of tube 24. The other end of the coil 25 is connected by a, wire 21 to wire 2| so that current can travel over the latter to the cathode of tube 24. The grid of tube 24 is connected through a resistor 28 to wire 2|. The grid and plate of tube 24 are connected to a tank circuit made up of a coil 29 and variable condenser 30. In the connection between this tank circuit and the grid of tube 24 is a fixed condenser 3 I.

1 Claim. (015128- 422) more particularly to high 'series.

I A wire 32 has one, end connected to coil 29 at ,a point which ;gives the greatest output of the high frequency oscillating circuit. The other end of wire 32 is connected to one of a number of evenly spaced switch points, 33. A noninductively wound coil 34 connects each. adjacent pair of switch points 33 except the first and last in the A switch. lever is pivoted to engage each switch point 33 consecutively. When said lever 35 engages the switch point 33 connected to wire 32 none of the coils will be in the circuit. As

the lever 35 is moved counter-clockwise one more coil 34 will be connected at each switch point until all of the coils are connected.

The switch lever 35 is mounted on a shaft which is connected to a conventional electric motor 31 through any desired gear reduction desired, such as that indicated at 38. The motor 31 is supplied with current from supply wires 2 and 3 by wires 39 and 40. An oil and on switch 4| is provided in wire 40 to start and stop the motor. A patients electrode 42 is connected through a plug 43 and jack 44 and the latter is connected by means of a wire 45 to the switch lever 35.

A treatment electrode consisting of a shell 46 encloses a magnetic coil 41. A three way plug 48 has two of its connectors 49 connected to the current supply wires 39 and 40 to provide current for energizing the coil 41. The third connector 50 is connected by wire 5| to one end of the secondary coil 25 and current from the latter is led to the shell 46.

A resistance coil 52 is connected through a wire 53 to the center tap 54 of the coil 25. A switch lever 55 is adapted to cut in more or less of the resistor 52. The lever 55 is connected to a Jack 56 by a wire 5! and a small condenser 58 is connected across the wire 51 and beginning point of the resistor 52. A patient's electrode 59 is provided with a plug 60 adapted to connect to jack 56.

In operation, the tube l1 and its circuits oscillates at about times per minute, although any other rate of oscillation may be used. At each oscillation of tube I1 and its circuits a voltage surge is impressed on tube 24 and its oscillation circuits. The output oscillations of tube 24 are determined largely by the tank circuit consisting of coil 29 and adjustable condenser 30.

The electrode 42 receives low intensity oscillations continuously and high intensity surges at the peaks of the oscillations from tube I I and its circuits. The parts 24 to 42 are covered specifically in my copending application serial No. 5228, filed January 30, 1948.

The shell 43 is connected to an end oi. the

secondary coil 25 and therefore receives an alternating electric current. The voltage is higher at the peaks of oscillations of tube l1 and its circuits and lower between said peaks. The coil 41 is connected to supply wires 39 and 40 and receives a constant alternating voltage. In view of this current an alternating magnetic field is set up around said coil 41. This field is used generally in connection wit in on liv ng t s es- Electrode 53 is adapted to receive electrical current from the secondary coil 25 and a resistor 52 is used to reduce the intensity as desired. The, shell 46 and its connection with secondary coil 25 serves as a return circuit for electrode 59.

When the resistor 52 is properly set, very little current will reach electrode 59 between the peaks of the oscillations of tube l1 and its circuits However, at said peaks shocks of any severity d e sired may be had by changing the resistance of resistor 52. These controlled shocks are intended for use where the enervation in a tissue is below normal or where a controlled shock is desired.

I claim: -In an electrical therapeutic device, an oscillatory heater tube, a transformer, a condenser,

said condenser and the primary coil of said trans,- former being arranged in a tank circuit, connece tions connecting said tank circuit with the heater and grid of said tube, a second condenser connected with the secondary coil of said transformer and adapted to form a second tank circuit, a second transformer, a connection connecting said second tank circuit to the primary coil of said second transformer and the plate of said tube in series, two electrodes, and connections between said electrodes and the secondary coil of said second. t ansiqrm s arrang ment being such that: h re i a ge difi renq be said electrodes.

FRED J. HART.

r a ERENcEs CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

